The processes accompanying CO2 migration or leakage through the geological seals of storage sites is an important research topic. It is exceedingly likely that intact water-saturated cap-rocks will act as capillary seals and prevent leakage of free CO2. However typical overburden successions contain faults and fractures and also natural fluid-flow pathways that are at least partially saturated with natural gas.
The sealing performance of these features may not be so good, particularly in the context of changing stress fields and increasing reservoir pressure as injection proceeds. If CO2 does enter the overburden a number of attenuation processes will be triggered, including diffusion and dissolution into the water phase and chemical reaction with the pore-fluid and rock minerals.
This meeting aims to bring together researchers from different disciplines, showing laboratory results, models and analysis of monitoring data from real storage sites, to discuss these issues, try to better understand them, and plan how further research might be developed.
The meeting proceedings including agenda, presentations etc can be downloaded here
AGENDA (click on presentation titles for available PDFs)
|Time||Speaker Name||Speaker Institution||Presentation Title|
Dr Anna Stork, University of Bristol (am)
Professor Michael Kendall, University of Bristol (pm)
|9.45 – 10.15||Arrival and registration|
|10.15 – 10.40||John Marshall||Shell||The Peterhead CO2 storage project – understanding subsurface containment issues|
|10.40 – 11.05||Lisa Roach||University of Leeds||Pre-Injection Assessment of Time-Lapse Seismic Repeatability at the Aquistore CO2 Storage Site using a Sparse Seismic Array|
|11.05 – 11.30||Coffee Break|
|11:30 – 11.55||Angus Best||University of Southampton||Physics of rocks for CO2 reservoir characterisation and monitoring|
|11.55– 12.20||Dan Faulkner||University of Liverpool||Deformation and fluid flow evolution of caprock during injection of CO2 from laboratory experiments|
|12.20 – 12.45||Sam Krevor||Imperial College London||Immobilisation in the permeable zone – Residual trapping, capillary heterogeneity and exsolution|
|12.45 – 13:30||Lunch|
|13:30 – 13.55||Laurence Cowton||University of Cambridge||How thick is a thin layer? 4D seismic monitoring of CO2 sequestration at the Sleipner Field|
|13.55 – 14.20||Andy Chadwick and Tom Bradwell||BGS||Musings on potential CO2 migration along pre-existing (or former) fluid flow pathways in the overburden|
|14.20 – 14.50||Coffee Break|
|14.50 – 15:15||Tom Lynch||University of Leeds||Modelling Stress Path and Fracture Pressure Hysteresis for CO2 storage in depleted reservoirs|
|15.15 – 15.40||James Verdon||University of Bristol||CCS and Induced Seismicity|
|15.40 – 17.00||Discussion|
Facilitated by Dr Andy Chadwick, BGS
|17.30||Dinner (The Mall Pub, 66 The Mall, Bristol BS8 4JG)|